Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
Formaldehyde is found in many products such as particle board, plywood, paneling, pressed-wood products and urea formaldehyde foam insulation. Some synthetic fabrics, especially permanent press, shampoos and cosmetics may also contain small amounts.Formaldehyde is also a product of combustion. When you burn materials such as natural gas, wood, gasoline or tobacco, formaldehyde gas is released.o, formaldehyde is still used in many consumer products. Since 1985, Minnesota has regulated the sale of wood products made with urea formaldehyde. Some common building materials have specific product standards that limit the amount of formaldehyde that can be released.